Multitouch strange behaviour

Getting Started Newbie Questions
#1

Hello, 

I’m still new to Corona but i noticed a strange behaviour about the multitouch function and i can’t understand what’s happening.

The problem is that if I touch a button (or any part of the screen) and at the same time while still holding the previous button I start touching multiple times any other part of the display then after some touches the multitouch stops registering the button I was holding.

This is a problem for me because I’m making a platform game and if i hold the run button and then touch the jump button multiple times (while still holding the run button) my character stops running after some jumps…

Any help will be appreciated  :slight_smile:

#2

Read the guide on touches and it will clarify how to handle multi-touch correctly.

Dig Here:

  1. First - https://docs.coronalabs.com/tutorial/events/tapTouchAnatomy/index.html
  2. Second - https://docs.coronalabs.com/guide/events/touchMultitouch/index.html

General Links You Should Use All The Time:

#3

Thank you I readed it and In the second tutorial you posted there is an example that gives me the same problem I’m facing with my game:

[lua]

– Activate multitouch

system.activate( “multitouch” )

 

– Create two display objects on the screen

local newRect1 = display.newRect( display.contentCenterX, 160, 60, 60 )

newRect1:setFillColor( 1, 0, 0.3 )

local newRect2 = display.newRect( display.contentCenterX, 320, 60, 60 )

newRect2:setFillColor( 0.3, 0, 1 )

 

– Touch event listener

local function touchListener( event )

 

    print( "Unique touch ID: " … tostring(event.id) )

 

    if ( event.phase == “began” ) then

        event.target.alpha = 0.5

        – Set focus on object using unique touch ID

        display.getCurrentStage():setFocus( event.target, event.id )

 

    elseif ( event.phase == “ended” or event.phase == “cancelled” ) then

        event.target.alpha = 1

        – Release focus on object

        display.getCurrentStage():setFocus( event.target, nil )

    end

    return true

end

 

– Add a touch listener to each object

newRect1:addEventListener( “touch”, touchListener )

newRect2:addEventListener( “touch”, touchListener )

[/lua]

If I touch the newRect1 button and while still touching newRect1 (holding the button) I touch multiple times newRect2 after some touches to newRect2 the focus on newRect1 is gone, Why is this happening? 
 

#4

If you want to be able to move and jump using separate buttons then do not use setFocus.  This is more for dragging - as only one object can ever be focused.

Just have one touch handler to move and another to jump.

#5

I tried removing setFocus but the problem is still there after a while the first button I’m holding stops registering and my character stops moving, only the second button works at that point… :frowning:

#6

You will need to use an enterFrame event and a variable to indicate if you have a move button pressed.  Do the movement in your enterFrame event.  when the user stops pressing the move button set the variable to false.

#7

Read the guide on touches and it will clarify how to handle multi-touch correctly.

Dig Here:

  1. First - https://docs.coronalabs.com/tutorial/events/tapTouchAnatomy/index.html
  2. Second - https://docs.coronalabs.com/guide/events/touchMultitouch/index.html

General Links You Should Use All The Time:

#8

Thank you I readed it and In the second tutorial you posted there is an example that gives me the same problem I’m facing with my game:

[lua]

– Activate multitouch

system.activate( “multitouch” )

 

– Create two display objects on the screen

local newRect1 = display.newRect( display.contentCenterX, 160, 60, 60 )

newRect1:setFillColor( 1, 0, 0.3 )

local newRect2 = display.newRect( display.contentCenterX, 320, 60, 60 )

newRect2:setFillColor( 0.3, 0, 1 )

 

– Touch event listener

local function touchListener( event )

 

    print( "Unique touch ID: " … tostring(event.id) )

 

    if ( event.phase == “began” ) then

        event.target.alpha = 0.5

        – Set focus on object using unique touch ID

        display.getCurrentStage():setFocus( event.target, event.id )

 

    elseif ( event.phase == “ended” or event.phase == “cancelled” ) then

        event.target.alpha = 1

        – Release focus on object

        display.getCurrentStage():setFocus( event.target, nil )

    end

    return true

end

 

– Add a touch listener to each object

newRect1:addEventListener( “touch”, touchListener )

newRect2:addEventListener( “touch”, touchListener )

[/lua]

If I touch the newRect1 button and while still touching newRect1 (holding the button) I touch multiple times newRect2 after some touches to newRect2 the focus on newRect1 is gone, Why is this happening? 
 

#9

If you want to be able to move and jump using separate buttons then do not use setFocus.  This is more for dragging - as only one object can ever be focused.

Just have one touch handler to move and another to jump.

#10

I tried removing setFocus but the problem is still there after a while the first button I’m holding stops registering and my character stops moving, only the second button works at that point… :frowning:

#11

You will need to use an enterFrame event and a variable to indicate if you have a move button pressed.  Do the movement in your enterFrame event.  when the user stops pressing the move button set the variable to false.